var a = 10;
var b = "20";
var c = ["a", "b", "c"];
var d = {a: 1, b: "你好", c: [1, 2, 3], func: function (){}};
var e = false;
// 创建一个数组
var cars = []
cars[0] = "别克"

function test() {
    return a * parseInt(b)
}

try{
    a * b
}catch {
    console.log(1)
}

console.log(c["a"], c.a, d.func())
console.log(b.length)

